diff --git a/postproc/rgb2rgb.h b/postproc/rgb2rgb.h
index fe7d98a1cd..f5cb903026 100644
--- a/postproc/rgb2rgb.h
+++ b/postproc/rgb2rgb.h
@@ -127,4 +127,6 @@ static void yuv2rgb_init (unsigned bpp, int mode){
 printf("broken, this should use the swscaler\n");
 }
 
+void sws_rgb2rgb_init(int flags);
+
 #endif